ABSTRACT

Low values of pavement friction increase crash rates. Some agencies such as FHWA and AASHTO have provided guidelines for the management of pavement friction, including the definition of minimum friction thresholds for roadway networks. Additionally, FHWA lists the Benefit-Cost Ratio (BCR) as one of the methodologies that can assist decision makers in the definition of these thresholds. However, there are limited studies that quantified the BCR of establishing minimum friction thresholds. The objective of this paper is to fill this research gap by providing a methodology to quantify the BCR of establishing minimum friction thresholds for roadway networks. Benefits are estimated in terms of the monetary value of crash reductions. Costs are estimated by considering: a) the cost for treating pavement sections, b) the monetary value of travel time delays, and c) the monetary value of road safety risks associated with work zones. The proposed framework was applied to a roadway network of 993 highway sections in Texas. The analysis was performed for Interstate Highways, Urban Freeways, and Arterials and Collectors. The proposed methodology can provide transportation agencies with an analytical tool to effectively estimate the BCR of maintenance policies intended to establish a minimum SN for a roadway network.

摘要

路面摩擦力值低会增加碰撞率。FHWA 和 AASHTO 等一些机构已经提供了路面摩擦管理指南，包括道路网络最小摩擦阈值的定义。此外，FHWA 将效益成本比 (BCR) 列为可以帮助决策者定义这些阈值的方法之一。然而，量化建立最小摩擦阈值的 BCR 的研究有限。本文的目的是通过提供一种量化建立道路网络最小摩擦阈值的 BCR 的方法来填补这一研究空白。收益是根据减少碰撞的货币价值来估计的。通过考虑以下因素来估算成本： a) 处理路面部分的成本，b) 出行时间延误的货币价值，以及 c) 与工作区相关的道路安全风险的货币价值。提议的框架应用于德克萨斯州 993 个高速公路路段的道路网络。对州际公路、城市高速公路以及主干道和集线器进行了分析。所提出的方法可以为运输机构提供一种分析工具，以有效地估计旨在为道路网络建立最小 SN 的维护政策的 BCR。